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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0102b68338d9ed6d9a55cb3f4961240d5aea1b90d7e086fef8e5e0420afa906f' 
  AND token = 'WSX99v77qTIhznCeJw8zNyJHbpWWXdx2ixlV1P8qwCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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