Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b98cb0d9e60b4a6c07c0d24bdb47dee10c19dc5c9c2a56c7f0485cabf73dabe' 
  AND token = 'q72BblJEM84OXDwAP3yK4pyhBWOFnhTYBHIufD037Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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