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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55e45cfe0b1022ce8116e7c6b974af7c3062d7f0ba81f55421d0aff4b6f3659' 
  AND token = 'XUkRRYEo4ylSJnP6LoEoKqCY5pwKo0vbuqt/GrQ0s7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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