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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd16e7361451b393f03b741e82614405e0a1133d1737f58653746bcede27e5904' 
  AND token = '5k3CRlLtddEDo11T/WhVrgq3UG8xt2J2mGa37P15VeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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