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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c8ece8953d3ed09e334cb81e947e624bff1cd9d908c26287b65951eb844dd91' 
  AND token = 'EAaXF5oMmDmNyjSi5x0cJ8Ca04yajqC6sIvjWmOaL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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