Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e052da56ad90506b9fdd1e0be3dae43d254bedeec0ee2fb06c514fdf6cc5c5' 
  AND token = 'yYWKlKk8PMcpng2cGNmL35K+3VTem6IQxjPf5IidNfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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