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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43254865fe0ea5a9bbc85f82a66d3faee96f0f2d6c08ce0d1653a827c5ce9c99' 
  AND token = '2FFykfRTqkckSs3t3PSfpMm8sh8mz5iieRV3Te6+nLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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