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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33be8d8d3b507ecc472ca220d1d043c10ff4de0e0b0022a4c93b3af15c31ee8c' 
  AND token = 'DvzqUNFucnBtbP509vwIeW8xb24aniGtJcGq8AfWb4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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