Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29f8fd80067c973f6d6c9d281b3016d7233f18a005772511daa1d362d08c4f35' 
  AND token = 'fp14XJJNJagLt3JcKVplBMbpMRCsUKm4uxcac57dWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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