SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cbe2d30bd5d1c2d28e440a4c83ca116ce4f577bfebb981f125133d627a22fff' 
  AND token = 'vCQbmGdm9BZbDrlrTQo9KWLsywHuZ3xq0VFqlWA3hsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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