SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e9f4ddfb322635b12bc37b62c43968fc356600b071a8bda171276ef1a525fb' 
  AND token = 'Jj1+1sqvxXP+bbPcZrU+XeCXGDGEN5J3pvbJfALLUjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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