SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a71d509427a267d0031d5f67bc16806648c0e4316516af7b03672ed3a33c7691' 
  AND token = 'sjg2jjJjKJeRWYiHejpChSyiiQD+XDIjhG2RLDq13ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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