SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e2be962f25b795ce90fb342cd04b3ec8f80216a6672ca5f7a5157c6e32487e2' 
  AND token = 'rKLmIoVzkqMulWbYxHBT1Wq/+HVYUmmi4MLI9HKtIus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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