Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfbd8567e31ecb44c8aed42aa82ccc8c19639518f45df4c7e082f9ebce0111d2' 
  AND token = 'FlzcVeNpNlgHIBIb/ZIdxf87fncfb5IT7A+1ip/HXE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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