SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd14d7160f4d1470c2e7902344bb533219a42e6eb4dd98f0f65777a78912f4e0b' 
  AND token = '/ouMRQJzRZiIktvUhGecMJMm6OKE9ZiKVn28/hPHWKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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