SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ebcc773cf6d20f4d861257f1ba0eff698f527a5cac8b9a150b0e806fd8e857' 
  AND token = 'YBSH/hsQwCQ9P6bvKNB6Jc4VNuxRUmAOIdOLhyU/dzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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