Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0d60b1ec8d7e479d503394344ce47e6e904fdf6b95fa39d99ed732a978fa95a' 
  AND token = 'Jx3x2mmzMrIH5SagC2QZkinEPJ6EMwE1T+6J5RzNbck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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