SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffeab7641f9bb32b18389f1cb633980a14c6764771ffbb5748a7d12a57cd2456' 
  AND token = 'FyxBYProVNalBtgJTuKbfizuQPB0tehyy3LYJEy3XWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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