SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df5158f21afa156f39f4f029c8869e99ca74d545dd3cbb5fe1b28c94b47246c5' 
  AND token = '1cP+ZjjxnXL6pRetmzEKpaHlTdfXRWfrFKkgh73OBiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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