SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c6b8f1b41b525e5c9a5f0dffb62c0befd2119533996eef2046a60e57c19349' 
  AND token = 'j/8vX+WoxjVPDqrRzVz+aPwlhJqmbhng/1XGKn9vUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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