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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ad17555652a4f594e25173775305d135a4c4f899c63c70a4349990cac6e3297' 
  AND token = 'NKCq7IjXn502SOAKGXyru0N4L5hVL6re8pt93XRUoKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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