SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '225c515dd6ff26152b6a8c1f23e04e4e362963a3b67957e4aecc22447b18051c' 
  AND token = 'YUFRPJx735TZopbFPn+wuJT9GiXcWV0clFvvpR4PY5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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