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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acfb96226bd02f0d87a8ad9e8c15abc74d66c77cd7a63232972bed1ddc476372' 
  AND token = 'wfCdt58uHqZDu93DAkgwrdGN20IebZj007Tvo5791jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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