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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b7686126ba1ce8f7f18ee87f25c7cab878422055d42aa06df6b3865c1113828' 
  AND token = '+or3dvbfpjfWQ6Kpx+08AmA1EChb2RjmsmPlp+hFa/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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