SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5342875b2754c552dce84956bbc43dbe6d2af076cf70158fb9f873ca2be91f1d' 
  AND token = 'z+LUDNXznG5lJ6Qkz72/71cX29jq0hvRuQYnvF09fPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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