SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e827e7de5b0c0b27586d24f4597bf00f13cf346194a5ddb4b19725e4159a758' 
  AND token = 'CMxGLjkGyMflJNlvHTeYYY4eDZ4uXeZlHu1bnVBz5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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