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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2adb5ed34ddb0ba7ca0ab6e069376de35c92fc8e13c35314c7e97adfbe4784ab' 
  AND token = '5n8Yeg4XZlerd5cV4DDMBVrWhh6uByo26yS5wzneUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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