SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bcc2b392fa7b10198e8dbd8b03f73c549f4254f1972870dc4a175137ad3737e' 
  AND token = 'tz45gkT028bGxJiCcAWOTnuzbjoMzVOWUR+P2HJ6hG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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