SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e4fe8c9ae0918523bdfdaf94bb50722cf4d90f3210287d487de49730da4c75a' 
  AND token = 'dTms7sFQHOWhBZnovtY2/ZAbg/FPuB/xkKmHEKw2U/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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