SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82f3ed36eda18f13edbdbf266ce84edfa6a7f0b9f35eee47f38abe21091763bc' 
  AND token = '7K57QKGKzVqM/UjbtJRmgcd3J4kDqUIHnEu3hGPCMnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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