Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8def3b58afa917682e1e8c4209e1c8d2ef02c79f74621525b8e06a2a4d97d70' 
  AND token = 'xwPgpaokd3HqIMHFLv+CMPjcGQdn2ppgs6HCTxRoxv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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