SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e7b5219f67ab42ca55f94bd636f712700fbc61f96b6229942804488aa92a033' 
  AND token = '+adnYzATr1XiC0TfkQdFMbMZzk6+LGKS1IKUqIxrDLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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