SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a393e1d146f20145c43269351d84d2ff2fee5dad1ca32486ea178e53bf2119' 
  AND token = 'Nv/EnLinfx3cbjYoyP30jgln4SRsxDB2WMsfaBEB7Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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