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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa4bf8dde821e4b874c1c4019a8282acca00dd68b6e100fe438b5c5fc811617' 
  AND token = 'tZZVxx2kqkS/aqmwJKxICS52Jo5uU+d5LrmWaHcB3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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