SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0af4c7d2b13209f92c58256884492dbb99a326b46bf2030a98eb6e58b41794b' 
  AND token = 'LfGqTv3BqRXvFLcqR+rC/O8ppABps1H6dTUYKbbBMcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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