SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bfb4b350268947893afc89333eb88fde042e6d4d7fa8a57dd3d5f75e0c67186' 
  AND token = 'c93mJIsL//bjYVb9Oa2ZuI+IYUIN+vmeQ8FDDhyxtds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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