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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51bef562306810a6201e2b719c98fbc079ec5e6c0b0a051bc676732b0ff713e4' 
  AND token = '8SF+yd45p4SvMveuVOHSTOyawgrCYCFoePU+sNXkU7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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