Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6f6000bc8b79631dfaf74425d1ce0e08d3c17ed3a11054a5a371cd70e46b4dc' 
  AND token = 'fEw2LFGgkOqKGfNrVr1K9m4uY2LqDzE7ZbOqa8Gcm0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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