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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '199abcd672832ac05dda8d990c3f117bc4bc053a570ed929de75d5bcab738448' 
  AND token = 'c+yZCadkMZ6uz5klrDU4K2lJ9dtqXY4PvPhU38FP+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}