SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4ceeef0c1f22bdc6620c71108fd953bdd58f583b2fa49bcf3fd5427f813f718' 
  AND token = 'yxzarr5ulxdOo7UwRpqS37O+FkoEBgV9ljj7vvpw3us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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