SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '731fcada885cc006e3df6805b0ae3a205a6d97068319fe39b23cb8067514b210' 
  AND token = 'Th5DFVgkl3+yKzqmCXftEg51RzpjsHcPTmpy/b6nNl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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