SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '048bfcb51d3a8740e6e70c280d8474bd9159e64c35794e5e93f88076f499dac6' 
  AND token = 'AGCxSxQOlTor2A+mJwvugxwXnxgWByIZi14XWxS2X9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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