Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca0b8b760ec93e1a249d258b09443959f24c7db314a6fb2cbe2048ec078fe79e' 
  AND token = 'fttJm6fHFltZ+14Wtllx1iLik2m76+seU9n0L9Dd7W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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