SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '679277165bbb62a7179728ff19a7ed3fd633222ce4ce74041b29f5cabf0171d5' 
  AND token = '8iqimhuvsr7LyOsYKX9pVpcFL7aWpeD/ijU+96GWFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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