SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '739b5cce0ed06867e0d5401c7014f7e65be41c36bbe5e5f078fc92a6a37b514f' 
  AND token = 'sq2sV8Yu0oFQmY2vV/doQEntFj7g/jOXOMu6WKRVXfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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