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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838846d0954d670cfa0073f5aae01dc19e098c8eefbe3006ea4429a919024a55' 
  AND token = 'FA/uHvA/FBKejfGtpPW1G8+wV+Fl+T03wStFP50An0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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