SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58c25ebd386252b20fb74db68160f48273bfa3d51f5bc3bbf1bd4d0791a63fe0' 
  AND token = 'gB4yg+4vzz4Yypir/VDMxi4p4O1Kg/++xmtBJzCASTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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