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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab8cca8aed2a65b7a4252b4234f8c38add5fe7025a52bd075936e914c056e31c' 
  AND token = 'f/UK6ck0fezBLL7BsrTw6TffGu9RhH5Jo/mDMRWMRBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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