SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81125964b777ea621509aadb588c9d9bd534ad7ff387fbe885d82c132c85cf40' 
  AND token = 'gKh33lXF7hjBb/HYzOtJVVXPE0lXsfSVfDFH0P86bRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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