SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cd2eef08df09b8547e786ee49d8941fc106a5b50472bb3f89db77d9b62215b2' 
  AND token = 'i8Lw3Z+j/ADSl4UL9lowKJxARFuxvjyyv6Ef6ohPwEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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