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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f113e29bfb8b18742730877e43030f0126246e5e17617c0d43e7bf44fdc52d6c' 
  AND token = '1XDsysRh6Q1X0bQfVRvF97SfQkSWGcX00qhNJXvuV/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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