SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14cd3a2cd603816abc16a4f37b9112f16c6fe27e46bd08ba4a26979f4abf764b' 
  AND token = 'cJXzBBJcwsJpG/HEh5yvYsNm1G2cu1POcUUfXSvUH3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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