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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d61e270ff5f94903fbe4711ab1c31d6eee52a537bd2f37fc930190fcf5b068a' 
  AND token = '9vm4CXs8rWd6rs0Xcy68Ny7J1uOxGxPIT8tDsCudzA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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