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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46e83be977d87f1bd58e1c92eb0f10acd533b7cd562438f06648a76ff801176' 
  AND token = 'c/4Scea1QCY2TGB/6niBWk7FpvsDXDKs/+Kppc021dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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