SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bc7aafca07decb6321d043f70be0e5d07879b8ee5a89e56b77c4a63fcabd2c1' 
  AND token = 'G7fsASGwZIlvEqIJVnDPnzB/CeN7zuAwNdTUK1+8CLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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