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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93f0bbf95bbdd79fae32541ff93ad2019d7b315fbd294f2cede66d10d703581' 
  AND token = 'MdvtvJvsrvZIknufgy1DUH1/IH+sr8TAe2wwh3Ou/Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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