SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b816477617a57b0f7a53e8af738aed1e9475c47913129b070f447fcaf0e03abf' 
  AND token = 'phxZVVIgl2sKlhTOxyUnDFk4HBYMMPVquJPNFqT8IkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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