Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '368da59858bce66998807f35d9e0e3e16664bda6d1bb973a07dfaac9c1437a90' 
  AND token = '5/e3WT7mhU53HzpU+lcu/haZaOxs/8vd439KFIPvDgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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