SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb98920366b6622eb0063545c4113ee32ff9fc7f408a1bcb356fc0485a4f959c' 
  AND token = 'BOZJ8Bslimhf4VnU89tseDx0FQ/nzbG/W4m6ZHdwKAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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